Windows 95 Err Msg: This Application Has Performed an Illegal...

 Last reviewed: September 13, 1995
Article ID: Q118539
The information in this article applies to:
  • Microsoft Windows 95

SYMPTOMS

When you try to run an MS-DOS-based application, Windows 95 reports the following error message: 

   This application has performed an illegal operation and will be
   terminated. Quit all applications and then restart your computer.

   The application attempted to execute an invalid instruction.
   Fault location: 2067:0127.

CAUSE

Some MS-DOS-based applications load a DOS extender to provide access to memory above the 1-megabyte (MB) range for executable code. Older MS-DOS- based applications may load incompatible versions of DOS extenders and cause the above error.

The following applications are known to exhibit this problem: 

   Abraxas versions of Yacc and Lex: PCYACC 3.01 and PCLEX 2.05

RESOLUTION

Contact the manufacturer of your application to obtain an updated DOS extender.

MORE INFORMATION

The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

KBCategory: kberrmsg kb3rdparty kbprb
KBSubcategory: wpp95 win95 appscomp diskmem
Additional reference words: 95 3rdparty err msg

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Last reviewed: September 13, 1995
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